SiUS341802E
Troubleshooting by Error Code
Service Diagnosis
222
2.36 Wet Alarm
Error Code
F4
Applicable
Models
All outdoor unit models
Method of Error
Detection
In cooling operation, detect the condition under which liquid refrigerant returns to the compressor,
according to the temperature and pressure of each part.
Error Decision
Conditions
When the following wet state continues for a period of 90 minutes, an alert is issued.
An error is defined for 120 minutes.
Wet state in outdoor units
When the following wet state continues for a period of 45 minutes, an alert is issued.
Wet state in some of indoor units
Supposed
Causes
Defective suction pipe thermistor
Defective discharge pipe thermistor
Defective high pressure sensor
Defective indoor unit electronic expansion valve
Dirty air filter
Troubleshooting
Connect the Service Checker.
Mount a pressure gauge on the
high pressure service port.
Reset the operation, and then
restart the operation.
Stop the relevant indoor units while the
system is in cooling operation, and then
check for the liquid pipe temperature of these
indoor units after the system is stabilized.
The liquid pipe
temperature is low
(equivalent to the evaporating
temperature).
Clean the air filters
of the indoor units.
NO
YES
NO
Replace the indoor
unit electronic
expansion valve.
Replace the relevant
thermistor.
YES
YES
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Are the
characteristics of the
accumulator inlet thermistor and
the suction pipe thermistor
normal?
NO
Replace the discharge
pipe thermistor.
Are the
discharge pipe
thermistor characteristics
normal?
YES
NO
Replace the high
pressure sensor
(S1NPH).
Are the
high pressure sensor
characteristics
normal?
Service Checker
Use the Service Checker to find indoor units operating under the following conditions:
&
• Gas pipe temperature – Liquid pipe temperature < 2.5˚C (4.5˚F)
• Electronic expansion valve opening < 300 pulses
Содержание Aurora Series
Страница 316: ...Wiring Diagrams SiUS341802E 303 Appendix 1 Wiring Diagrams 1 1 Outdoor Unit RXLQ72TATJU 2D112580A ...
Страница 317: ...SiUS341802E Wiring Diagrams Appendix 304 RXLQ96 120TATJU 2D112581A ...
Страница 318: ...Wiring Diagrams SiUS341802E 305 Appendix RXLQ72TAYDU 2D112582A ...
Страница 319: ...SiUS341802E Wiring Diagrams Appendix 306 RXLQ96 120TAYDU 2D112583A ...
Страница 320: ...Wiring Diagrams SiUS341802E 307 Appendix RXLQ72 96 120TAYCU RXYQ72 96 120 144 168TAYCU 2D112579A ...
Страница 330: ...Wiring Diagrams SiUS341802E 317 Appendix 1 3 2 Energy Recovery Ventilator VAM Series VAM300 470 600GVJU 3D073269C ...
Страница 331: ...SiUS341802E Wiring Diagrams Appendix 318 VAM1200GVJU 3D073270C ...
Страница 332: ...Revision History Month Year Version Revised contents 04 2018 SiUS341802E First edition ...